Propeller.



H. M. SVEBILIUS.

PROPELLEB..

Patented Feb. 20, 1912 HENRY M. SVEBILIUSOF CHICAGO, ILLINOIS.

i PROEELLER.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed July 24, 1911. SeriaLNo. 640,236.

To all whom it 'may concern.

Be it known that I, HENRY M. Svnmmus, a citizen of the United States of America, and a resident of Chicago,'county of Cook, State of Illinois, have invented certain new and useful Improvements in Propellers, of which the following is a specification.

Themain objects of this invention are to provide an improved form of propeller having the blades thereof separately mounted and relatively adjustable to various angular positions relative to each other, whereby changes in the vnumber' of blades may be made, or, in case of accident to one or more of the blades, the remaining blades may be readjusted to equal angular spacing and thereby avoid irregular thrust of the propeller and consequent limping of the vessel driven thereby.

An illustrative embodiment of this invention is Vshown in the accompanying drawings in which:

Figure l is a perspective view of a propeller constructed according to this invention, showing four blades located in certain angular positions relative to each other. Fig. 2 is a similar view showing three blades angularly spaced equal distances. Fig. 3 is a similar view showing two blades. Fig. 4r is a view similar to Fig. l, showing the blades angularly located relative to 'each other in substantially a spiral relation. Fig. 5 is a sectional end elevation taken on the line A-A of Fig. l.

In the construction shown in the drawings the propeller comprises a rotary supporting member or shaft 1, the end of which is threaded to receive a nut 2. An annular shoulder 3 is formed on the shaft inward from -jsaid threaded end. The blades 4 are each integrally formed on a hub member 5,

there being but one blade for each hub. As shown in the drawings the shouldeiifg is located at such a dist-ance from the nut 2 as to accommodate the maximum number Aof the hub members 5 which it is intended to use uniformly spaced lugs or projections 6 and notches 7. The 'shoulders or lugs G and notches 7 on respectively adjacent vmembers are adapted to have intertitting engagement for the 'purpose of securing the blades 4 in their relative angular positions, the lugs and notches being uniformlyv spaced to permit the .hub members 5 to be set so as to locate the blades 4 in any desired angular positions relative to each other, as circumstances may require. The hub members are set in the desired position and the nut 2 is screwed up firmly so that the blades are selcured against relative movement angularly or axially.

One of the hub members 5 is provided with a keyway 8' adapted to receive the key 9 xed in the shaft l preferably adjacent to the shoulder 3. The said hub member is secured against relative rotation on the shaft, whereby all the members are similarly secured by virtue of their interlocking engagement. Y

If one of the propeller blades on the propellerl herein shown becomes broken and a new blade is not at hand with which toreplace the broken one, the hub member from which the blade has been broken may be removed and the remaining blades [symmetrically arranged on the shaft. It is also possible to use this propeller with three or two blades. When less than Jour blades are used a blank hub member or filler l() is used in. conjunction with the other v hub members, as shown'in Figs. 2 and 3, the

said blank hub member heilig provided with lugs and notches on its ends which are adapted to have interlocking engagement with the remaining hub members. To en' able this result to be accomplished, the number of projections and also the number of indentations on each of the adjacentI ends of adjacent `hub members should be a common multiple of. thenumbers l, 2, 3,' etc.,

up to a number corresponding to the total` number of blades in the propeller. That is to say, if there are four blades, ythe number of notches should be Ia common multiple of l., 2, 3, and 4, that is, 1 2, as shown in the drawings, or a multiple thereof. 'y

Although but one specific embodiment of this invention is herein shown and described,` it will be understood that some of the details of the constructionshown may be altered or omitted without departing from the spirit of this invention, as defined bythe I' following claim. l

I claimtl each of such adjacent ends of the hub mem- 10 A propeller, comprising a rotary supportbers being a common multiple of the factors ing member, a plurality of hub members 1, 2, 3, etc., up to the total number of blades. adapted to be axially mounted on said sup- Signed at Chicago this 18th-day of July, porting member, a single blade on each of 1911.

said hub members, the adjacent ends of said HENRY M. SVEBHUS. hub members being provided with uni- Witnesses: ormly spaced, interitting projections and ALICE CASS,

indentations, the number of projections on EDWIN PHELPS. 

